Part identity and key ratings
The LC1E18004N7IN is a 4-pole (4NO) contactor from the Schneider Electric Easy TeSys Control range, rated for AC-1 resistive loads at 40 A up to 415 V.
The 4P configuration gives you four normally-open power poles, so you can switch a three-phase load plus a neutral, or gang two poles per phase for higher current. The non-overlap time of 1.5 ms between NC and NO contacts on both energisation and de-energisation is a safety feature — it guarantees that break-before-make timing, which matters in interlocking circuits where you can't have two contactors closed simultaneously.
Operating altitude rated to 3000 m, and the TH protective treatment (pollution degree 3) means it handles industrial atmospheres with some condensation or light contamination.